I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
butanes butenes betaines botanies buttons badness boutons betonies botanize botanise bittiness battiness bawdiness beadiness batons betons battens beduins bedunce biotins boudins bedouins
phytanes cetanes soutanes butanes stanes tans atones pittance duotones witans tansy betaines hotness titaness tunes jitneys detains tetanies wetness ketenes witneys tains attains tines butenes stance stones dittanies tautness tetanus titans whatness witness chutnees shaitans retunes chutneys quietness botanies routines retenes ratanies mutines attunes tynes patness tones gitanos poutines laitance fitness meetness patines reattains ratans rattans retains retines stains seitans cotans ratines fatness litanies neatness ketones mootness quittance sheitans